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Hello! I have the follow question to ask.
In the operate system ,I write a multithread program, in order to test the highest CPU usage when the certain number of the thread are concurrent.
The experimental data is as follow: 
the thread number the highest usage of CPU 
5 16 
25 32 
50 28 
55 32 
60 28 
61 30 
62 32 
63 30 
64 31 
100 30 
500 29 
1000 29 
 
Conclusion:The number of thread is from 25 to 1000, the highest usage of CPU fluctuates between 28 and 32.
Qusetion: 
1、 Why not the usage of CPU is higher than 32%? 
2、 In the Windows Server 2008 R2 Enterprise, are there any restrictions for the CPU usage of the process ?

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<blockquote data-quote="EDN Admin" data-source="post: 779645" data-attributes="member: 20559">Hello! I have the follow question to ask. &nbsp;In the operate system ,I write a multithread program, in order to test the highest CPU usage when the certain number of the thread are concurrent. &nbsp;The experimental data is as follow:&lt;br/&gt;the thread number&nbsp; &nbsp; the highest usage of CPU&nbsp; &lt;br/&gt;5&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 16&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &lt;br/&gt;25&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 32&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &lt;br/&gt;50&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 28&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;br/&gt;55&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 32&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &lt;br/&gt;60&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 28&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &lt;br/&gt;61&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 30&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &lt;br/&gt;62&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 32&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &lt;br/&gt;63&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 30&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &lt;br/&gt;64&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 31&nbsp; &lt;br/&gt;100&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 30&lt;br/&gt;500&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 29&lt;br/&gt;1000&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 29&nbsp; &lt;br/&gt;&lt;br/&gt;Conclusion:The number of thread is from 25 to 1000, the highest usage of CPU fluctuates between 28 and 32. &nbsp;Qusetion:&lt;br/&gt;1、 Why not the usage of CPU is higher than 32%?&lt;br/&gt;2、&nbsp; In the Windows Server 2008 R2 Enterprise, are there any restrictions for the CPU usage of the process ? <a href="http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/99809ae4-19b4-4284-a767-6aee3a79df42" target="_blank">View the full article</a></blockquote>

[QUOTE="EDN Admin, post: 779645, member: 20559"] Hello! I have the follow question to ask. In the operate system ,I write a multithread program, in order to test the highest CPU usage when the certain number of the thread are concurrent. The experimental data is as follow: the thread number the highest usage of CPU 5 16 25 32 50 28 55 32 60 28 61 30 62 32 63 30 64 31 100 30 500 29 1000 29 Conclusion:The number of thread is from 25 to 1000, the highest usage of CPU fluctuates between 28 and 32. Qusetion: 1、 Why not the usage of CPU is higher than 32%? 2、 In the Windows Server 2008 R2 Enterprise, are there any restrictions for the CPU usage of the process ? [url=http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/99809ae4-19b4-4284-a767-6aee3a79df42]View the full article[/url] [/QUOTE]

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